<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<h3>a instanceof b：a对象的原型链上有没有b的原型</h3>
			
	</body>
</html>
<script type="text/javascript">
	function AAA(){
	}
	var aaa = new AAA()
	console.log(aaa instanceof AAA)
</script>